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Evolution of a Holocene banner bank controlled by morphodynamics and structural setting of a macrotidal coast: Saint-Brieuc Bay (NW-Europe)

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Geoscience Frontiers 2021年第5期12卷 166-181页

作者： Kalil Traoréa David Menier Erwan Gensac Pascal le Roy Clément Lambert Paul Bessin Kevin Pedoja Anne Duperret Romain le gall Laboratoire Géoscience Océan UMR 6538CNRSUniversitéBretagne SudCampus de Tohannic56000 VannesFrance Laboratoire Géoscience Océan UMR 6538CNRSIUEMUniversitéBretagne Occidentale29280 PlouzanéFrance Laboratoire de Planétologie et Géodynamique UMR 6112CNRSLe Mans UniversitéAvenue Olivier Messiaen72085 Le Mans CEDEX 9France Laboratoire Morphodynamique Continentale et Côtière UMR 6143CNRSUniversitéCaen Normandiecampus 12-4Rue des Tilleuls14000 Caen cedexFrance Laboratoire Ondes et Milieux Complexes UMR 6294CNRSUniversitéLe Havre Normandie53 rue de PronyCS8054076058 Le Havre cedexFrance

The morphology and internal structure of the Horaine Bank(Bay of Saint-Brieuc,NW France)are described based on multibeam echosounder and high-resolution seismic datasets coupled with vibro-core *** Horaine Bank shows large-scale bedforms in the lee of a submerged rocky shoal,which allowed defining it as a Banner *** internal structure of the sandbank reveals four seismic units(U1-U4)on a Cambrian basement(U0).The basal unit U1 is interpreted as reworked lowstand fluvial sediments those infilled micro incised valleys during a rise in sea *** unit is overlain by paleo-coastal barrier sand-spit(U2)whose development was controlled by swell in the context of a rapid rise in sea *** successive prograding unit(U3)is interpreted as flooding deposits in continuity with unit *** unit U4 is characterized by oblique reflectors oriented in two opposite *** last unit,dated post 3500 yr BP,corresponds to migrating dunes superimposed on the bank and observable in the high-resolution bathymetric *** strong correlation between tidal currents and the apparent clockwise migration of dune crests suggests the presence of a tidal gyre controlling the present-day dynamics of most of the Horaine bank *** study proposes a new model for the construction of banner banks characterized by the gradual transition of a sand spit to a banner bank during marine transgression and ensuing hydrodynamic variability.

关键词： Sand banks Banner bank Holocene climate Geomorphology Sea level rise Tidal gyre

tuning the properties of confined water in standard and lybrid nanotubes： An infrared spectroscopic study

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Nano Research 2018年第9期11卷 4759-4773页

作者： Yuanyuan Liao Pierre Picot Maxime Laine Jean-Blaise Brubach Pascale Roy Antoine Thill sophie le Caer LIONS NIMBE UMR 3685 CEA CNRS Universite Paris-Saclay CEA Saclay Bt. 546 F-91191 Gif-sur-Yvette Cedex France Synchrotron SOleIL AIleS Beamline L'Orme des Mefisier Saint-Aubin BP 48 F-91192 Gif-sur-Yvette Cedex France

Imogolite is a natural nanotubular aluminum silicate clay mineral found in volcanic soils. Its well-defined, tunable structure makes it a good candidate for studying water confinement in a one-dimensional （1D） structure. Water confinement in self-sustaining imogolite thin films was studied using infrared spectroscopy. Two types of synthetic imogolites were investigated： pristine imogolite （IMO-OH） with a hydrophilic inner surface covered with Si-OH groups and hybrid imogolite （IMO-CH3） with a hydrophobic inner surface covered with Si-CH3 groups. Both imogolites have an outer surface that is covered with Al-OH groups. Infrared spectra were recorded in the 20-4,000 cm^-1 spectral range as a function of relative humidity. Analysis of the O-H stretching band provides information on the H bonding of confined water molecules inside and outside the IMO-OH tubes. The scenario for water filling as a function of relative humidity is determined for both systems. Adsorption begins in the IMO-OH tubes at the lowest relative humidity （〈 10%）. The inner surface of the tubes is first covered with water molecules; then, the central part of the tubes is filled, leading to very strong H bonds and a structured spectrum. In contrast, the H bonds of water adsorbed on the outer surfaces of these tubes are weaker. A different scenario is observed for water inside IMO-CH3： Weakly H-bonded water molecules are present, similar to that observed in carbon nanotubes. Water confinement in imogolites is governed by the hydrophilicity of the inner walls. At similar partial pressures, the degree of H bonding depends on the interactions between water and the nanotube wall.

关键词： imogolite nanotubes confinement infrared spectroscopy water isotherms hydrophilic hydrophobic

Ageing evaluation of cable insulations subjected to radiation ageing:Application of principal component analyses to Fourier Transform Infra-Red and dielectric spectroscopy

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High Voltage 2022年第4期7卷 652-665页

作者： Simone Vincenzo Suraci Sandrine Amat lea Hippolyte Astrid Malechaux Davide Fabiani Claire le gall Océane Juan Nathalie Dupuy LIMES Department of ElectricalElectronic and Information EngineeringUniversity of BolognaBolognaItaly Aix Marseille University Avignon UniversitéCNRSMarseilleFrance Institut de Radioprotection et de Sûreté Nucléaire MarseilleFrance

The evolution of properties of crosslinked polyethylene(XLPE)-based insulating mate-rials under radio-chemical ageing conditions is presented and *** total,seven different polymer compounds were tested,characterised by an increasing quantity of additives,for example,antioxidants(AOs)and fillers as flame *** were analysed using different testing techniques,that is,Fourier Transform Infra-Red and dielectric *** allowed a broad characterisation of the polymer,bringing to good correlations between the arising of new chemical groups caused by ageing and the modifications on the complex ***-based AOs are found to be the most efficient in terms of protection against *** the contrary,flame retardants are concluded not to have any impact on the material *** data were then treated using the principal component *** data treatment successfully distinguished the material composition(with and without additives)and the ageing *** results confirm the relevance of this analysis in understanding the impact of irradiation on the chemical and functional properties of the polymer materials studied.

关键词： component principal bringing

Investigation of KTiOPO4 nanocrystals by means of second-harmonic light emission

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Chinese Optics letters 2008年第1期6卷 64-67页

作者： Chunyuan Zhou Loc le Xuan Abdallah Slablab Nicolas Sandeau sophie Brasselet Dominique Chauvat Jean-Francois Roch Laboratoire de Photonique Quantique et Moléculaire ENS Cachan UMR CNRS 8537 61 avenue du President Wilson 94235 Cachan Cedex France

The finding of nonlinear nanometric-sized probes is of key importance for the development of nonlinear microscopy in physical as well as biological sciences. We isolate nonlinear KTiOPO4 nanocrystals and study them by second-harmonic generation microscopy （SHGM） and atomic force microscopy （AFM） independently. With both polarization analysis and defocused imaging of the emitted second harmonic field, we extract the Euler angles of the crystalline axes of a single nanocrystal. A balanced coherent optical homodyne detection shows the coherent nature of the nanocrystal nonlinear emission and allows a phase measurement of the emitted second-harmonic field. These features make the KTiOPO4 nanocrystal a good candidate for a vectorial probe of electromagnetic near fields.

关键词： KTiOPO4 谐波光发射物理学

TRPV1 and TRPA1 in cutaneous neurogenic and chronic inflammation： pro-inflammatory response induced by their activation and their sensitization

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Protein & Cell 2017年第9期8卷 644-661页

作者： Olivier Gouin Killian L'Herondelle Nicolas lebonvallet Christelle le gall-lanotto Mehdi Sakka Virginie Buhe Emmanuelle PIee-Gautier Jean-Luc Carre Luc lefeuvre Laurent Misery~,Raphaele le Garrec Laboratory on Interaction Neurons-Keratinocytes (LINK) University of Western Brittany 29200 Brest France Uriage Dermatological Laboratories 92400 Courbevoie France

Cutaneous neurogenic inflammation （CNI） is inflammation that is induced （or enhanced） in the skin by the release of neuropeptides from sensory nerve endings. Clinical manifestations are mainly sensory and vascular disorders such as pruritus and erythema. Transient receptor potential vanilloid 1 and ankyrin 1 （TRPV1 and TRPA1, respectively） are non-selective cation channels known to specifically participate in pain and CNI. Both TRPV1 and TRPA1 are co-expressed in a large subset of sensory nerves, where they integrate numerous noxious stimuli. It is now clear that the expression of both channels also extends far beyond the sensory nerves in the skin, occuring also in keratinocytes, mast cells, dendritic cells, and endothelial cells. In these non-neu- ronal cells, TRPV1 and TRPA1 also act as nociceptive sensors and potentiate the inflammatory process. This review discusses the role of TRPV1 and TRPA1 in the modulation of inflammatory genes that leads to or maintains CNI in sensory neurons and non-neuronal skin cells. In addition, this review provides a summary of current research on the intracellular sensitization pathways of both TRP channels by other endogenous inflammatory mediators that promote the self-maintenance of CNI.

关键词： sensory nervenflammation inflammatory geneneurogenic skinregulation pruritus

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微通道内气-液传质研究

化工学报 2006年第6期57卷 1296-1303页

作者：乐军陈光文袁权罗灵爱 le gall Hervé 中国科学院大连化学物理研究所 LOCIE 3/ ESIGEC 3/ Université de Savoie Campus ScientifiqueSavoie Technolac73376Le Bourget-du-Lac cedexFrance DCPR-CNRS-ENSIC 1rue Grandville BP 45154001 NANCY CedexFrance

以CO2-H2O为模型体系,实验考察了当量直径为667 μm的单通道和16个并行通道内的气-液传质行为.实验发现,液体表观速度增加,单通道内液侧体积传质系数明显提高;同一液体表观速度下,液侧体积传质系数随气体表观速度增加而增加;在实验数据... 详细信息

以CO2-H2O为模型体系,实验考察了当量直径为667 μm的单通道和16个并行通道内的气-液传质行为.实验发现,液体表观速度增加,单通道内液侧体积传质系数明显提高;同一液体表观速度下,液侧体积传质系数随气体表观速度增加而增加;在实验数据基础上关联了液侧体积传质系数与气-液两相流参数间的关系.微通道内的液侧体积传质系数较常规尺度气-液接触设备至少高1～2个数量级.并讨论了并行微通道内气-液两相流分配特性对整体传质性能的影响,表明合理设计气、液流动分布结构,可保证微通道内优异的传质特性.

关键词：微通道气-液两相流传质过程强化

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IF钢退火过程中再结晶数学模型的探讨

金属学报 2001年第2期37卷 147-150页

作者：叶卫平陈铁群 R. le gall G. Saindrenan 武汉理工大学材料科学与工程学院 ISITEM Nantes University 44306 Nantes Cedex 03

采用传统ＪＭＡＫ模型和一种新的再结晶模型研究了经７０％，８０％和９０％冷变形的ＩＦ（无间隙原子）钢再结晶过程．实验结果表明，以Ｉｎ（－Ｉｎ（１－ｘｖ））为纵坐标和Ｉｎｔ为横坐标进行回归，ＪＭＡＫ图呈直线关系，其... 详细信息

采用传统ＪＭＡＫ模型和一种新的再结晶模型研究了经７０％，８０％和９０％冷变形的ＩＦ（无间隙原子）钢再结晶过程．实验结果表明，以Ｉｎ（－Ｉｎ（１－ｘｖ））为纵坐标和Ｉｎｔ为横坐标进行回归，ＪＭＡＫ图呈直线关系，其ＪＭＡＫ指数ｎ在１．３３－２．５１之间，低于理想的ＪＭＡＫ指数．采用一个新的再结晶模型对ＩＦ钢的再结晶过程进行了分析，用非线性回归方法回归出该模型的参数.该模型可将再结晶过程与其组织参数联系起来，具有明确的物理意义，能较好地用于描述ＩＦ钢再结晶过程．

关键词： IF钢再结晶数学模型退火汽车

Effect of Zeolite on Small Intestine Microbiota of Broiler Chickens:A Case Study

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Food and Nutrition Sciences 2017年第1期8卷 163-188页

作者： Sandrine le gall-David Vincent Meuric Gaelle Benzoni sophie Valière Alain Guyonvarch Jacques Minet Martine Bonnaure-Mallet Microbiology Team EA 1254 Universitéde Rennes 1RennesFrance Hospital RennesFrance Invivo NSA Saint NolffFrance INRA UAR 1209Castanet-TolosanFrance INRA GeT-PlaGeGenotoulCastanet-TolosanFrance CNRS-IGDR-UMR 6290 RennesFrance AMADEUS Platform-Biosit RennesFrance

After ban of antibiotics growth promoters (AGP) in Europe in 2006, use of non-medicated gut microbiota regulators as feed additives has dramatically increased. This study aimed at describing the effects of a copper-exchanged zeolite on broiler growth performance, small intestine morphology and microbiota composition. Illumina Sequencing of the V3-V4 region of the 16S rRNA gene was employed to study the small intestine microbiota. This microbiota with copper-exchanged zeolite treated-chickens was significantly less diverse with an almost exclusive presence of Lactobacillus johnsonii and Lactobacillus reuteri. These Lactobacilli are correlated with increased diameter, length and weight of the three segments of the small intestine and decreased viscosity of the intestinal content, suggesting probiotic action. The tested copper-exchanged zeolite would act as a prebiotic, selecting a “favorable” flora for the healthy broilers development.

关键词： Microbiota Chicken Growth Promoting Zeolite Bacitracin

Multiplexed detection and differentiation of bacterial enzymes and bacteria by color-encoded sensor hydrogels

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Bioactive Materials 2021年第12期6卷 4286-4300页

作者： Zhiyuan Jia Mareike Müller Tony le gall Martijn Riool Max Müller Sebastian A.J.Zaat Tristan Montier Holger Schönherr Physical Chemistry I&Research Center of Micro and Nanochemistry and Engineering(Cμ) Department of Chemistry and BiologyUniversity of SiegenAdolf-Reichwein-Straße 257076SiegenGermany Univ Brest INSERMEFSUMR 1078 GGFBF-29200BrestFrance Department of Medical Microbiology and Infection Prevention Amsterdam institute for Infection and ImmunityAmsterdam UMCUniversity of AmsterdamMeibergdreef 91105AZAmsterdamthe Netherlands CHRU de Brest Service degenetique medicale et de biologie de la reproductionCentre de Réference des Maladies Rares《Maladies neuromusculaires》F-29200BrestFrance

We report on the fabrication and characterization of color-encoded chitosan hydrogels for the rapid,sensitive and specific detection of bacterial enzymes as well as the selective detection of a set of tested bacteria through characteristic enzyme *** patterned sensor hydrogels are functionalized with three different colorimetric enzyme substrates affording the multiplexed detection and differentiation ofα-glucosidase,β-galactosidase andβ-*** limits of detection of the hydrogels for an observation time of 60 min using a conventional microplate reader correspond to concentrations of 0.2,3.4 and 4.5 nM of these enzymes,*** on their different enzyme expression patterns,Staphylococcus aureus strain RN4220,methicillin-resistant ***(MRSA)strain N315,both producingα-glucosidase,but notβ-glucuronidase andβ-galactosidase,Escherichia coli strain DH5α,producingβ-glucuronidase andα-glucosidase,but notβ-galactosidase,and the enterohemorrhagic ***(EHEC)strain E32511,producingβ-galactosidase,but none of the other two enzymes,can be reliably and rapidly distinguished from each *** results confirm the applicability of enzyme sensing hydrogels for the detection and discrimination of specific enzymes to facilitate differentiation of bacterial *** hydrogels thus possess the potential to be further refined as detection units of a multiplexed format to identify certain bacteria for future application in point-of-care microbiological diagnostics in food safety and medical settings.

关键词： Multiplexed biosensors Bacteria detection Bacterial enzyme Reporter hydrogels Colorimetric substrates